Try out new DEFMAX and DEFVST

[JONL at MIT-MC (Jon L White)]

I think most of the bugs are out of the DEFMAX/DEFMAC/DEFVST
scheme described in LISP;NEW RECENT;  there is a dumped XLISP
with most of the out-of-core files loaded, including the
soon-to-be releasd D/D/D stuff.  Try it out, for bugs and
misfeatures.